Can I use a trade name?

Yes, and it should appear on the special tax stamp, which means you will need to include it on the special tax return. If you use a trade name, it must also appear on your FFL. If you add (or delete) a trade name during the Tax Year, you are required to file an amended return (ATF Form 5630.7) with a letter request for the amendment of your special tax stamp. You must also amend your FFL.

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Bureau of Alcohol, Tobacco, Firearms and Explosives United States Department of Justice